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9x=3(4x-9)
We move all terms to the left:
9x-(3(4x-9))=0
We calculate terms in parentheses: -(3(4x-9)), so:We get rid of parentheses
3(4x-9)
We multiply parentheses
12x-27
Back to the equation:
-(12x-27)
9x-12x+27=0
We add all the numbers together, and all the variables
-3x+27=0
We move all terms containing x to the left, all other terms to the right
-3x=-27
x=-27/-3
x=+9
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